Loading...

A new study on binder performance and formulation modification of anti-corrosive primer based on ethyl silicate resin

Hoshyargar, F ; Sharif University of Technology | 2009

688 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.porgcoat.2009.02.006
  3. Publisher: 2009
  4. Abstract:
  5. Zinc-rich ethyl silicate coatings are quite successful in protecting steel against corrosion under severe exposing conditions. In spite of providing excellent cathodic protection to steel structure after film curing, two-component zinc-rich ethyl silicate coatings have some limitations, one of which is inadequate shelf life as a result of in-can binder gelation. In this work, the preparation steps of ethyl silicate such as pre-hydrolysis, dehydration and organometallic reactions were surveyed and herein an approach towards understanding the cause and effect relationship of the use of ingredients is presented. The effects of water and catalytic acid dosages on gel time under accelerated conditions and the effect of alcoholic solvent order on the rate of the hydrolysis and dehydration reactions were studied via Karl-Fischer test determining the water content of hydrolysate. A thriving optimization in shelf life without any loss in physical-mechanical characteristics of the final film (e.g. hardness, adhesion, solvent and salt spray resistance) was obtained. © 2009 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Ethyl silicate binders ; Gel time ; Partial hydrolysis ; Pre-hydrolysis ; Shelf life ; Zinc-rich ethyl silicate primer ; Binders ; Cathodic protection ; Coagulation ; Dehydration ; Dewatering ; Gelation ; Gels ; Hydrolysis ; Organometallics ; Resins ; Semiconducting zinc compounds ; Steel ; Water content ; Zinc ; Silicates
  8. Source: Progress in Organic Coatings ; Volume 65, Issue 3 , 2009 , Pages 410-413 ; 03009440 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0300944009000411